Anatomical Landmarks

Question 1

Words that describe how dental images will appear

Answer 1

radiolucent and radiopaque

Question 2

Radiolucent

Answer 2

black, dark gray

Question 3

Radiopaque

Answer 3

white, light gray

Question 4

Facial landmarks

Answer 4

Tragus of ear and ala of nose

Question 5

How should the patient be sat for intra oral images?

Answer 5

Mid-sagittal plane perpendicular to the floor

Occlusal plane must be parallel to the floor

Question 6

How must the patient be sat for extra oral mages?

Answer 6

ala-tragus line parallel to floor

Question 7

Radiologic appearance of enamel

Answer 7

radiopaque

most dense structure in human body

Question 8

Radiologic appearance of dentin

Answer 8

internal portion of tooth radiopaque- less dense than enamel

Question 9

Radiologic appearance of cementum

Answer 9

Unable to see– because it is less dense than dentin

Question 10

Radiologic appearance of pulp

Answer 10

radiolucent- composed of nerves and blood vessels –> soft tissue

Question 11

Radiologic appearance of alveolar bone

Answer 11

radiopaque- composed or cortical and cancellous bone

Where teeth erupt from and how they are maintained in the jaw

Question 12

Radiologic appearance of cortical bone

Answer 12

Radiopaque (dense)
compact or dense form of bone which lines the outside layers of the maxillary arch or mandible. Immediately surrounds and supports teeth

Also referred to as cribiform plate or lamina dura– continuous with alveolar crest– Borders the cancellous bone

Question 13

Radiologic appearance of cancellous bone

Answer 13

Appears less radiopaque than the lamina dura– it is less dense

“Spongy”

Question 14

Radiologic appearance of periodontal ligament

Answer 14

radiolucent line– between tooth and lamina dura

Question 15

Radiologic appearance of nutrient canals

Answer 15

radiolucent lines in bone containing blood vessels and sometimes exhibit radiopaque borders

Question 16

Landmarks of the maxillary arch around central/lateral incisors

Answer 16

Incisive foramen/anterior palatine foramen
Median palatine suture
Nasal Fossae
Nasal septum
Inferior nasal conchae

Question 17

Radiologic appearance of incisive foramen/anterior palatine foramen

Answer 17

Radiolucent, oval shape between the apices of the central incisors

Question 18

Radiologic appearance of median palatine suture

Answer 18

Radiolucent, extends posteriorly through the midline of the palate

Question 19

Radiologic appearance of nasal fossae

Answer 19

2 radiolucent areas upper portion of radiograph; air spaces

Question 20

Radiologic appearance of nasal septum

Answer 20

radiopaque between nasal fossae

Question 21

Radiologic appearance of inferior nasal conchae

Answer 21

wafer-like bone located in nasal fossa

Question 22

Landmarks of the maxillary arch near the cuspids

Answer 22

Nasal fossa
Maxillary sinus
Typical “Y” of maxillary sinus

Question 23

location of nasal fossa from cuspids

Answer 23

Upper left corner

Question 24

Radiologic appearance of maxillary sinus

Answer 24

Radiolucent- air space above bicuspids

Question 25

Radiologic appearance of typical "Y" of maxillary sinus

Answer 25

Radiopaque- where the upper front wall of maxillary sinus joins with the floor of the nasal fossa

Question 26

Maxillary Bicuspid landmarks

Answer 26

Maxillary sinus | Zygomatic or Malar bone

Question 27

Radiologic appearance of zygomatic or malar bone

Answer 27

Rdiopaque- U shaped

Question 28

Landmarks of the maxillary arch on molar radiographs

Answer 28

``` Maxillary sinus Zygomatic process Zygoma Maxillary tuberosity Medial plate of the pterygoid process or Hamular process Coronoid process ```

Question 29

Radiologic appearance of zygomatic process

Answer 29

U shaped radiopacy in the apical region of the 1st and 2nd molars superimposed over the molar root tips

Question 30

Radiologic appearance of the zygoma

Answer 30

Radiopaque- superimposed over maxillary molar sinus- extending posteriorly from the zygomatic bone

Question 31

Radiologic appearance of maxillary tuberosity

Answer 31

Radiopaque

Question 32

Radiologic appearance of Medial plate of pterygoid process or hamular process

Answer 32

Radiopaque- tendon attachment for muscle fibers

Question 33

Radiologic appearance of coronoid process

Answer 33

Radiopaque- serves as a point of muscle attachment

Question 34

Landmarks of the mandibular arch at central incisors

Answer 34

``` Lingual foramen Genial tubercles mental ridge/process Inferior border of the mandible Mental fossa ```

Question 35

Radiologic appearance of Lingual foramen

Answer 35

radiolucent- between the apices of the central incisors

Question 36

Radiologic appearance of genial tubercles

Answer 36

radiopaque- surrounds the lingual foramen

Question 37

Radiologic appearance of mental ridge/process

Answer 37

Radiopaque, thickening of bone- located below the apices of the anterior teeth (labial)

Question 38

Landmarks of the mandibular arch at the cuspids

Answer 38

Mental foramen | Inferior border of the mandible

Question 39

Radiologic appearance of mental foramen

Answer 39

radiolucent- lies inferior to the apices of the bicuspids (labial)

Question 40

Landmarks of the mandibular arch at the bicuspids

Answer 40

Mental foramen Mylohyoid ridge (internal oblique ridge) Inferior border of mandible

Question 41

Radiologic appearance of mental foramen at the bicuspids

Answer 41

may be superimposed over the root apices of the bicuspids Between them

Question 42

Radiologic appearance of mylohyoid ridge

Answer 42

Radiopaque- below the apices of the molars

Question 43

Landmarks of the mandibular arch at the molars

Answer 43

``` Submandibular fossa External oblique ridge Internal oblique ridge Mandibular canal Inferior border of mandible ```

Question 44

Radiologic appearance of submandibular fossa

Answer 44

large, irregularly shaped area below roots of mandibular molar in which the bone thickening is reduced, often mistaken for a tissue

Question 45

Radiologic appearance of external oblique ridge

Answer 45

Radiopaque- terminates in the region of the 3rd molar/ outer surface of the mandible

Question 46

Radiologic appearance of internal oblique ridge

Answer 46

Radiopaque- inferior to the EOR also refered to as the mylohyoid ridge Extends more anterior than the EOR- internal surface of mandible

Question 47

Radiologic appearance of mandibular canal

Answer 47

Radiolucent- carries nerves and blood vessels; travels to area of mental foramen